feat: enable restic for home-pc

services/restic/home-pc.nix

@@ -0,0 +1,38 @@
+{ config, lib, pkgs, ... }:
+
+# using the restic cli:
+# load credentials into shell via: export $(cat /path/to/credentials/file | xargs)
+# useful commands for analysing restic stats [snapshot-id], restic diff [s1] [s2],
+
+with lib;
+with builtins;
+let common = import ./common.nix { inherit config lib pkgs; };
+in {
+  environment.systemPackages = with pkgs; [ restic ];
+
+  services.restic.backups.full = common.resticConfig {
+    name = "home-pc";
+    dynamicFilesFrom = let
+      ignore = builtins.toFile "excludes" ''
+        /var/lib/lxcfs
+        /var/lib/docker
+        /home/*/.local/share/Trash
+        /home/*/.cache
+        /home/*/Downloads
+        /home/*/.npm
+        /home/*/.steam
+        /home/*/.local/share/Steam
+        /home/*/.local/share/lutris
+        /home/felschr/sync
+        /home/felschr/Sync
+        /home/felschr/keybase
+      '';
+    in ''
+      ${pkgs.ripgrep}/bin/rg \
+        --files /etc/nixos /var/lib /home \
+        --ignore-file ${ignore}
+    '';
+    timerConfig.OnCalendar = "0/4:00:00";
+    extraPruneOpts = [ "--keep-last 6" ];
+  };
+}